More than an ADC, delta sigma modulator shall very effectively be used as a filter, when the sampling rate is appropriately choosen.
When we have an extremely low sampling rate, as low as about 2000SPS, the Sync 4 filter inside the delta sigma adc will strip down the frequency components above 1000 Hz, infact, the sync4 filter has good response to frequencies below 200Hz..
So, if you send a stream of pulses to the ADC, we would get the average value of it.
Caution : Choose the range of the ADC Cleverly, as that might result in a poor resolution(here, average value), if not properly choosen.
Regards,
Rahul ram
